Inside selvedge motion for use in looms



arch 22, 1955 B. MASSON ETAL 2,704,558

INSIDE SELVEDGE MOTION FOR USE IN LOOMS Filed Nov. 16, 1953 2 Sheets-Sheet 1 FIG. 1

IN V EN TORS 552M420 M45504! M p/se- 1/154 0 4 0RE aeieqa/'z flrralavsi March 22, 1955 B. MASSON ET AL INSIDE SELVEDGE MOTION FOR USE IN LOOMS 2 Sheets-Sheet 2 Filed Nov. 16, 1953 FIG. 6,

IN V EN TORS United States PatentO INSIDE SELVEDGE MOTION FOR USE IN LOOMS Bernard Masson, Conrbevoie, Moise Thibault, Argenteuil,

and Andr Berquier, Le Pre St. Gervais, France, assignors to Societe dApplications Generale dElectricite & de Mecanique, Paris, France Application November 16, 1953, Serial No. 392,394

Claims priority, application France November 17, 1952 7 Claims. (Cl. 139-54) This invention relates to textile machines, and more particularly to inside selvedge motions for use in looms, elslpeicially for use in circular looms having a horizontal s e An object of the invention is to provide an inside selvedge motion by means of which a selvedge may be obtained which has a higher resistance than the hitherto customary gauze shed, although only one thread is used instead of the hitherto customary two threads.

Another object of the invention is to provide an inside selvedge motion which may be attached to any suitable part of the loom without the necessity of using special shaft frames.

Another object of the invention is to provide an inside selvege motion by means of which a pair of inside selvedges can be made.

A further object of the invention is to improve on the art of inside selvedge motions for looms as now customarily made.

Other objects and structural details of the invention will be apparent from the following description when read in conjunction with the accompanying drawings forming part of this specification, wherein:

Fig. 1 is a fragmentary vertical sectional view of one half of a circular loom provided with an inside selvedge motion according to the invention,

Fig. 2 is an elevational view taken in the direction of the radial arrow II of Fig. 1, said view illustrating the belt arrangement of the inside selvedge motion according to the invention,

Fig. 3 is a sectional view of the cutting device for the opening of the cloth,

Fig. 4 is an elevational view of the cloth, partly cut by the cutting device,

Fig. 5 illustrates a cloth with a selvedge obtained by means of an inside selvedge motion according to the invention, and,

Fig. 6 is an elevational view of a different embodiment of an inside selvedge motion according to the invention for the manufacture of two inside selvedges.

Referring now to Fig. l, a support 1 fixed to the cover 4 of the circular reed 5 of a circular loom carries a rotatable pulley for changing the direction of the crossing thread 3. A downward extension of said support 1 carries another rotatable pulley 6 arranged for changing the direction of a belt 7 carrying an eyelet 8 and being arranged between the reed 5 and the shafts 12 and 13. The horizontal edge 9 of said downward extension of the support 1 acts as a guard by limiting the lifting of the border yarns f1 and f2 which, otherwise, could be caught between the belt 7 and the pulley 6.

The crossing thread 3 being wound off from a bobbin 10 subjected to the action of a brake 10 formed by a spring-loaded finger passes through the guiding eyelet 11' arranged on a spring-loaded rod 11" of an inclined compensating device 11 capable of absorbing the differences in the length of the thread 3 caused by the movements of the eyelet 8 during the operation of the loom. Preferably, means are provided for adjusting the action of the spring urging the finger of the brake 10 against the winding on the bobbin 10. Upon leaving the compensating device 11, the crossing thread 3 passes above the shafts of the shafts 12 and 13 onto the pulley 2 from which it descends in a vertical direction in front of the shaft 13 for passing through the eyelet 8 attached to the belt 7. Thence, the thread 3 passes through the reed 5 for joining Patented Mar. 22, 1955 the weaving ring 14. Owing to the arrangement of the pulley 2 in a plane above the shafts 12, 13 and the reed 5, a frictional engagement of the crossing thread 3 with the shafts is avoided.

The ends of the belt 7 are connected with ropes 15 or the like which in turn are connected with treadles 24. Each treadle is actuated by a cam 18. Thus, the belt 7 is reciprocated during the operation of the loom, and the stroke of the belt 7 is chosen in such a way that the crossing thread 3 forms a shed of sufficient amplitude. If desired, means may be provided for adjusting the stroke of the belt 7. The reciprocation of the belt 7 gives the crossing thread 3 a path in the form of an inverted U as necessary for obtaining the desired selvedge.

As best shown in Figs. 3, and 4, a cutting device arranged above the driving drums of the loom comprises a knife or blade 16, for example in the shape of a razor blade, which is exchangeably mounted in a slot of a rotatable arm 17. The upper end of the arm 17 is bent downwardly so that the blade 16 is at an angle A relative to the horizontal plane. The blade 16 is also inclined relative to the weft threads 27 to be cut. The supporting arm 17 of the blade 16 bears on the inside selvedge for guiding same so that the blade 16 does not touch the selvedge but remains in the axis of the cutting zone. The pivotal arrangement of the arm 17 assures an automatic adjustment of its position.

All elements of the cutting device may be readily mounted on any point of the circular loom without change of existing members and they may be repeated as often as necessary.

The operation of the inside selvedge motion according to the invention is as follows:

While the yarns f1 and 2 follow the movement of the woven weave, in the instant case for example a plain weave, the crossing thread 3 engaged with the eyelet 8 on the reciprocating belt 7 describes a path in the shape of an inverted U by the action of the earns 18 and treadles 19 in synchronism with the movement of the shafts and the passage of the shuttles. The thread 3 is alternatively at the right and at the left of the two yarns f1 and f2.

For example the following positions occur during the weaving of a plain weave:

After the passage of the shuttle No. 1:

Crossing thread 3 is at the right, Yarn fl is low, and Yarn is is high.

After the passage of the shuttle No. 2: Crossing thread 3 is at the left, Yarn ft is high, and Yarn f2 is low,

and so on.

A weaving of the crossing thread 3 is assured, if, in the position of rest, said crossing thread is placed lower than the axis of the shed when the point of the shuttle located in said axis presents itself. Therefore, the stroke of the belt must be sufficient for giving the shed of the crossing thread an' amplitude substantially higher than the normal half shed of the respective loom.

Fig. 5 illustrates selvedges 25 made in a cloth 26 woven by means of a loom having an inside selvedge motion according to the invention. This selvedges are in the form of chain stitches.

According to the embodiment shown in Fig. 6 a single belt 20 is provided with two eyelets 8 and 8. Said belt is trained around two pulleys 6 carried by the support 1 and a third pulley or roller 21 rotatably mounted on a support 22 fixed to the frame 23 of the loom.

Preferably, the distance 2 between the pulleys 6 is smaller than the diameter of the pulley 21, so that the distance between the two selvedges is reduced.

Thus a pair of inside selvedges can be made with a single inside selvedge motion according to Fig. 6. The advantage of this embodiment is obvious, inasmuch as the inside selvedges are obligatorily arranged in pairs.

We have described preferred embodiments of our invention but it is understood that this disclosure is for the purpose of illustration and that various omissions or changes in shape, proportion and arrangement of parts, as well as the substitution of equivalent elements for those, herein shown and described, may be made without departing from the spirit and scope of the invention as set forth in the appended claims.

For example the belt 7 or 20 may be reciprocated by means other than those shown in the drawings. If desired, for example, the movements of the shafts or other elements of the loom may be utilized for reciprocating the belt.

Moreover, instead of two cams and two treadles, only one cam and one treadle connected with one end of the belt may be used, the other end of the belt being under the action of a weight or a spring counter-acting the action of the cam driven treadle.

What we claim is:

1. An inside selvedge motion for looms, comprising in combination: reciprocable means, actuating means associated with said reciprocable means for reciprocating same, first guiding means for engagement with a crossing thread, said first guiding means being attached to said reciprocable means for participation in the movements of the latter, second guiding means for engagement with said crossing thread, and supporting means for attachment to the loom, said supporting means carrying said reciprocable means and said second guiding means, and said two guiding means being arranged for guiding the crossing thread above the shafts of the loom and through the space between said shafts and the reed of the loom.

2. An inside selvedge motion for looms, comprising in combination: supporting means for attachment to the loom, a first pulley rotatably mounted on said supporting means, a belt trained around said first pulley, actuating means associated with said belt for reciprocating same, a guiding element for engagement with a crossing thread, said guiding element being attached to said belt for participating in the reciprocating movements of the latter and a second pulley rotatably mounted on said supporting means for guiding engagement with said crossing thread, said second pulley and said guiding element being arranged for guiding the crossing thread above the shafts of the loom and through the space between said shafts and the reed of the loom.

3. An inside selvedge motion for looms, comprising in combination: first supporting means for attachment to the loom, a pair of spaced first pulleys rotatably mounted on said first supporting means, second supporting means for attachment to the loom, a roller rotatably mounted on said second supporting means remote from and offset to said first pulleys, a belt trained around said first pulleys and said roller in zig-zag arrangement, actuating means associated with said belt for reciprocating same, a pair of guiding elements attached to said belt at parallel portions thereof for participation in the reciprocating movements of said belt, each of said guiding elements being arranged for engagement with a crossing thread of a pair of crossing threads, and a pair of spaced second pulleys rotatably mounted on said first supporting means, each of said second pulleys being arranged for guiding engagement with one of said two crossing threads, said pair of second pulleys and said pair of guiding elements being arranged for guiding the crossing threads above the shafts of the loom and through the space between said shafts and the reed of the loom.

4. In a loom, the combination of: a reed, reciprocable shafts, reciprocable means, actuating means associated with said reciprocable means for reciprocating same, first guiding means for engagement with a crossing thread, said first guiding means being attached to said reciprocable means for participation in the movements of the latter, second guiding means for engagement with said crossing thread, and stationary supporting means carrying said reciprocable means and said second guiding means, said two guiding means being arranged for guiding the crossing thread above said shafts and through the space between said shafts and said reed.

5. In a loom as claimed in claim 4, said reciprocable means being arranged between said shafts and said reed.

6. In a loom as claimed in claim 4, said second guiding means being arranged above said reed.

7. In a loom as claimed in claim 4, compensating means for operative engagement with the crossing thread so as to take up slackness of the thread caused by the reciprocation of the first guiding means attached to the reciprocable means.

References Cited in the file of this patent UNITED STATES PATENTS 819,420 Garisio May 1, 1906 

